Tracking the apparent movement of a stationary target following prior stimulation by rotation was used to estimate the subjective velocity of the visual motion aftereffect. 10 Ss were given 4 trials each with the apparent velocity averaged over a 10-sec. period following 60 sec. stimulation. The intertrial interval was 5 min. The mean apparent rotation was 1.5° per sec. with SD of 1.6°.
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